A non-enzymatic amperometric hydrogen peroxide sensor based on iron nanoparticles decorated reduced graphene oxide nanocomposite

A simple and facile green process was used for the synthesis of iron nanoparticles (FeNPs) decorated reduced graphene oxide (rGO) nanocomposite by using Ipomoea pes-tigridis leaf extract as a reducing and stabilizing agent. The as-prepared rGO/FeNPs nanocomposite was characterized by transmission electron microscopy, X-ray spectroscopy and Fourier transform infrared spectroscopy. The nanocomposite was further modified on the glassy carbon electrode and used for non-enzymatic sensing of hydrogen peroxide (H2O2). Cyclic voltammetry results reveal that rGO/FeNPs nanocomposite has excellent electro-reduction behavior to H2O2 when compared to the response of FeNPs and rGO modified electrodes. Furthermore, the nanocomposite modified electrode shows 9 and 6 folds enhanced reduction current response to H2O2 than that of rGO and FeNPs modified electrodes. Amperometric method was further used to quantify the H202 using rGO/FeNPs nanocomposite, and the response was linear over the concentration ranging from 0.1 mu M to 2.15 mM. The detection limit and sensitivity of the sensor were estimated as 0.056 mu M and 0.2085 mu A mu M-1 cm(-2), respectively. The fabricated sensor also utilized for detection of H202 in the presence of potentially active interfering species, and found high selectivity towards H2O2. (C) 2016 Elsevier Inc. All rights reserved.